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[Bug libc/12113] Segmentation fault in dynamic loader on AVX enabled OS and CPU with AVX
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: Wed, 13 Oct 2010 11:07:12 +0000
- Subject: [Bug libc/12113] Segmentation fault in dynamic loader on AVX enabled OS and CPU with AVX
- Auto-submitted: auto-generated
- References: <bug-12113-131@http.sourceware.org/bugzilla/>
http://sourceware.org/bugzilla/show_bug.cgi?id=12113
--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2010-10-13 11:06:46 UTC ---
nptl/sysdeps/x86_64/tls.h has
# if __WORDSIZE == 64
long int __unused2;
/* Have space for the post-AVX register size. */
__m128 rtld_savespace_sse[8][4];
void *__padding[8];
# endif
} tcbhead_t;
sysdeps/x86_64/dl-trampoline.S has
vmovdqa %ymm0, %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE
vmovdqa %ymm1, %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE
vmovdqa %ymm2, %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE
vmovdqa %ymm3, %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE
vmovdqa %ymm4, %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE
vmovdqa %ymm5, %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE
vmovdqa %ymm6, %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE
vmovdqa %ymm7, %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE
...
vmovdqa %fs:RTLD_SAVESPACE_SSE+0*YMM_SIZE, %ymm0
vmovdqa %fs:RTLD_SAVESPACE_SSE+1*YMM_SIZE, %ymm1
vmovdqa %fs:RTLD_SAVESPACE_SSE+2*YMM_SIZE, %ymm2
vmovdqa %fs:RTLD_SAVESPACE_SSE+3*YMM_SIZE, %ymm3
vmovdqa %fs:RTLD_SAVESPACE_SSE+4*YMM_SIZE, %ymm4
vmovdqa %fs:RTLD_SAVESPACE_SSE+5*YMM_SIZE, %ymm5
vmovdqa %fs:RTLD_SAVESPACE_SSE+6*YMM_SIZE, %ymm6
vmovdqa %fs:RTLD_SAVESPACE_SSE+7*YMM_SIZE, %ymm7
But rtld_savespace_sse may not be aligned at 32byte.
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